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Xion /
Created December 28, 2014 14:28
Cell enum from Taphoo
* An utility class to hold ranges of cells' values.
* @author Xion
final class CellRanges {
* Private constructor to prevent instantiation.
Xion /
Created November 3, 2011 18:16
Very simple optimization problem
# The wreck of a plane in a desert is 15 miles from the nearest point A on a straight road.
# A rescue truck starts for the wreck at a point on the road that is 30 miles distant from A.
# If the truck can travel at 80 mph on the road and at 40 mph on a straight path in the desert,
# how far from A should the truck leave the road to reach the wreck in a minimum time?
from math import sqrt
def truck_time(turn_point):
road_distance = turn_point
skipped_road_distance = 30 - turn_point
from jinja2.ext import Extension
from jinja2.nodes import CallBlock, Output, MarkSafe
class CaptureExtension(Extension):
''' Generic capture extension, useful for providing
content that should go into specific places in HTML template,
such as the <head> tag for JavaScript includes.
Syntax for providing content for so-called 'dataset' (here it's "js"):
Xion / gist:1804474
Created February 11, 2012 21:54
A neat little numerical puzzle
This puzzle is (allegedly) solved by elementary school children in 5 to 10 minutes,
but adults usually struggle with it much longer.
Xion /
Created March 23, 2012 15:47
Monads in Python!
# Monadic IO
def print_(s):
def _():
print s
return _
def some_io():
for x in ['Hello', 'World']:
yield print_(x)
Xion /
Created August 5, 2012 15:57
Arrow-controlled movement in console with ncurses and Python
#!/usr/bin/env python
import curses
curses.KEY_LEFT: (0, -1),
curses.KEY_UP: (-1, 0),
curses.KEY_RIGHT: (0, 1),
curses.KEY_DOWN: (1, 0),
Xion /
Last active October 11, 2015 00:18
Scrambling word letters in legible way
import random
def scramble(text):
"""Scrambles the letters in given text, except for first
and last one in every word.
words = text.split()
for i in xrange(words):
if len(words[i]) < 3:
Xion /
Created October 25, 2015 23:02
SQLAlchemy column type for storing Python enums
from enum import Enum
from inspect import isclass
import re
from sqlalchemy.types import TypeDecorator, TypeEngine
__all__ = ['EnumType']
def objectproperty(func):
"""Alternate version of the standard ``@property`` decorator,
useful for proeperties that expose setter (or deleter) in addition to getter.
It allows to contain all two/three functions and prevent PEP8 warnings
about redefinion of ``x`` when using ``@x.setter`` or ``@x.deleter``.
Xion /
Last active December 14, 2015 18:39
Enhance Flask url_for() with optional _strict argument
import re
from flask import url_for
from myflaskapp import app
def url_for_ex(endpoint, **values):
"""Improved version of standard Flask's :func:`url_for`
that accepts an additional, optional ``_strict`` argument.
:param _strict: If ``False``, values for the endpoint are not checked